# r/R 带这个前缀叫raw字符串
# u/U 带空上前缀叫 unicode 字符串
str1 = 'a'
str2 = r"a\nb"
str3 = u"a\nc"
str4 = r"a\bb"
str5 = u"a\bb"
print(str1)
print(str2)
print(str3)
print(str4)
print(str5)
